the Carvallar Project

Processing thousands of transactions per second, supporting delivery of 1,000,000,000+ items annually, and growing its user base with an average 4 new registrations per minute. This is the scale of the world-class e-commerce system that is being developed using a state-of-the-art technology stack and a reactive, scalable, resilient and responsive system architecture.

Great Workplace!

The project is being built by multiple self-organizing teams of 5 to 8 highly-skilled engineers. Each team owns the application code as well as infrastructural code and the infrastructure itself. These autonomous teams make their own sound technical decisions based on current best practices and internal testing.


Technology stack


  • JavaScript / ES 6
  • React.js
  • Node.js
  • SPA


  • Reactive microservices with Java 8
  • Vert.x
  • rxJava
  • Polyglot persistence


  • AWS
  • Kubernetes
  • Ansible
  • CloudFormation
  • Docker
  • Packer
  • Immutable infrastructure
  • Infrastructure as code

We are looking for...

Frontend Engineers

Someone fluent with modern web development techniques.


Software Engineers

Our product needs a passionate and experienced Java dev to help it grow.


Lead Software Engineers

Seasoned Java engineer with both technical proficiency and leadership skills.


Product Managers

Product Managers who will help driving complex product development

Monthly salary: 11 000 – 20 000 PLN


Technical Project Managers

A methodical, self-organized and action-oriented Technical Project Managers

Monthly salary: 8 000 – 14 000 PLN


Pros of working for VirtusLab

  • Private healthcare and sport card
  • Fresh fruits, snacks
  • Discount for conference tickets
  • Scala and Spark trainings
  • Access to company’s collection of software engineering books
  • Three spacious offices right in the center of Krakow, near bus and tram station
  • Integration and sport events
  • Employment contract or B2B cooperation
  • Strong & experienced teams
  • Sharing knowledge attitude (eg. R&D meetings, Deep learning book reading club)
  • Openness to new ideas, approach, improvement
  • Short way from idea to realization
  • Open source initiatives
  • Transparent rules of getting promoted - Engineer progression (where you can find salaries and ranges, steps to be promoted etc.)
  • Virtusity - possibility of becoming certified Lightbend trainer (and travel around the world teaching people & companies)
  • Possibility of representing company as a speaker for several conferences/meetings
  • Flat structure
  • Flexible working hours
  • Switching between projects and technologies (Scala, Java, Big Data or Frontend)
  • Partial remote work

Time waits for no man! Apply now!

Just fill out the fields, submit and we will contact you.